Additional remarks:
-) the dashed line under the solid line means. that the welding is made on the side were the arrow points
-) the bow is the symbol for a convex weld bead
-) normally the size of the welding should be marked with the type of measurement " a" or "z" ( at least according to european standard EN resp. international standards ISO)

acc. your modification
-) "10" is the welding size (you can see the size difference at the picture)
-) "4x" shows that you have 4 welding beads

Fillet weld
All around
Weld size is 3mm